Boys who are diagnosed with attention deficit-hyperactivity disorder (ADHD) are twice as likely to become obese in adulthood than those who did not have the condition when they were young, a new long-term study has shown.

The finding, published in the journal Pediatrics, revealed that men who have childhood ADHD were more likely to have a greater body-mass index (BMI) and obesity - even when they no longer experience symptoms of the condition. Among these men, socioeconomic status did not matter - all seemed to have a predisposition to becoming obese.